02-18-2008, 09:34 AM
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Any surface agitation will dispel CO2 as the surface tension is lessened, or broken, and allows for oxygen exchange. You could use a timer to run your system as I do. When the lights are on, the pumps are on. At night, when the plants need the CO2, the pumps are off. I learned of this little tidbit only recently after having the same observations as you. The timers are the same as on my lights. I went cheap and bought a model with fewer outlets on timers as I already had the lights on a seperate timer. I believe that I paid either $49 or $79 for my timers. The DELUXE, supercharged, all the whistles and bells model ran $149, I believe. Had I not already had the lighting in timers, I probably would have gotten the DELUXE, supercharged, all the whistles and bells model.
You may also want to check your water parameters as CO2 injection does change it considerably. You may have to make some adjustments to the amount of CO2 you use.